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    How to Dyno an Automatic Duramax

    We tried to dyno my brothers 2006 Duramax and we can't keep it from down shifting into 3rd gear. We would like to start the dyno run at a low RPM but we can't. Is there a way to hold the tranny in 4th gear and bring the RPM down to 1500 or so and then start the dyno run? Thanks Donovan
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